PatchSiren cyber security CVE debrief

CVE-2024-35807 Siemens CVE debrief

A vulnerability in the Linux kernel's ext4 filesystem could cause data corruption during online resize operations. The issue was resolved in the upstream Linux kernel. Siemens has identified this vulnerability as affecting the GNU/Linux subsystem of the SIMATIC S7-1500 TM MFP industrial control system. The vulnerability has a medium severity rating with a CVSS score of 5.5, requiring local access and low privileges to exploit, with a high impact on availability. No patch is currently available from Siemens; mitigations focus on restricting access to trusted personnel and ensuring only trusted applications are executed.

Vendor: Siemens
Product: SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
CVSS: MEDIUM 5.5
CISA KEV: Not listed in stored evidence
Original CVE published: 2024-04-09
Original CVE updated: 2026-05-14
Advisory published: 2024-04-09
Advisory updated: 2026-05-14

Who should care

Organizations operating Siemens SIMATIC S7-1500 TM MFP systems with the GNU/Linux subsystem enabled, particularly in industrial control and automation environments where system availability is critical. Security teams managing OT/ICS infrastructure should prioritize access controls until a patch becomes available.

Technical summary

The vulnerability exists in the ext4 filesystem implementation within the Linux kernel, specifically during online resize operations. The flaw could lead to filesystem corruption. The attack requires local access with low privileges and has no confidentiality or integrity impact, but causes high availability impact. The CVSS vector is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H. Siemens has confirmed the GNU/Linux subsystem of the SIMATIC S7-1500 TM MFP is affected, with no fix currently available as of the advisory publication.

Defensive priority

medium

Recommended defensive actions

Restrict interactive shell access to the GNU/Linux subsystem to trusted personnel only
Ensure only applications from trusted sources are built and executed on affected systems
Monitor for Siemens security advisories regarding patch availability
Apply defense-in-depth strategies for industrial control systems per CISA guidance

Evidence notes

CVE published 2024-04-09. CISA CSAF advisory ICSA-24-102-01 published same date. Siemens SSA-265688 cross-referenced. Modified 2026-05-14 per source metadata.

Official resources

2024-04-09